• What is Automotive slotted exhaust copper lock nut?

An automotive copper lock nut is used in conjunction with an exhaust stud, a lock nut is just like a standard nut, but the lock nut has the added function of locking itself to the stud thread. According to the international standard DIN14440/DIN14441,  the locking mechanism for this type of nut is based on the slit at the collar. The slit is collapsed before tightening onto the screw or bolt. As the nut is tightened onto the fastener, the slit expands, pinching the threads of the screw or bolt and locking the nut in place. 

• What is copper nut for? 

A exhaust manifold is subject to high heat which is generated from the engine cylinder. The heat along with vibration from a high revving engine where nuts expand from the heat and loose. A copper lock nut is useful when mounting a manifold to engine cylinder head. 

• The feature of Automotive exhaust copper lock nut.

The nut is strongly copper-plated and is therefore suitable in areas of extreme heat eg. exhaust manifolds. Suitable for temperatures from -70 to 400 degrees centigrade.